Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 209,654	$ 207,399
Less: accumulated depreciation	(97,510)	(86,907)
Total property and equipment, net	112,144	120,492
Servers
Property Plant And Equipment [Line Items]
Total property and equipment, gross	114,327	111,015
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	63,664	68,082
Computer hardware and software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	11,224	11,009
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	12,640	12,485
Construction in progress
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 7,799	$ 4,808